Overview of the experiment

1
Overview of the experiment

• MEG is being built (Beam line, Magnet, LXe, DC,
  TC, Elect., Software)
• Delays in some items O(months)
• We keep the deadline of starting data taking
  when the beam will start on 2006

2
Collaboration construction responsibilities
unchanged

• Spokespersons T.Mori, A.Baldini
• Technical Coordinator S.Ritt
• Detectors
• Beam line PSI P.-R.Kettle
• COBRA KEK/Tokyo W.Ootani
• Drift Chamber PSI J.Egger
• Timing Counter Genova/Pavia/Roma Cecchet/Gatti
• Photon Detector Tokyo/Pisa/KEK S.Mihara
• Trigger Pisa M.Grassi
• DAQ/Elec. PSI S.Ritt
• Offline C.Gatto/S.Yamada/F.Cei

UCI (W. Molzon)
3
Beam line BTS _at_ PSI
Dear colleagues! BTS progress report for
18.07.2005 morning - replace the Helium
transfer line 1100   - the Helium temperature
is achieved, coil is superconducting          
but Helium dewar is empty 1320   - receive full
Helium dewar 1530   - the BTS cryostat is full
1620   - ramp up current up to 30A, the field
in BTS is observed by           deflection of
steel screw, which hangs on wire at cryostat edge
...     - test and adjust quench protection
circuit 2000   - the current of 283 A is
reached The maximal current is limited by power
the supply maximal voltage and the power cable
resistance now. The BTS was tested up to 300 A at
Novosibirsk with another power supply. with
best regards,                     Dima
4
Beam line separator almost ready, experimental
area more and more crowded (platform, COBRA
barrack...)
5
COBRA mag. field measurements and comparison with
calculations going on
6
LXe calorimeter

• Liquid phase purification successfully tested
• PMT base modifications tested Ok
• 110 PMTtested at Pisa (rate of about 3/day)
  starting at PSI
• Delay in cryostat construction (3 months)
  bureaucracy steel property

With Filter, no noise observed, narrow pedestal
7
Drift chambers

• Detailed measurements of geometry during
  construction procedure to get the final values
  and to check tools being established

Timing counter

• APDs received OK
• Mechanical drawing of the transverse part almost
  finished
• Final desig of the TC electronics (long.
  tansverse) almost ready
• He bag being studied

8
Calibrations

• Proton accelerator int. on Li target (17.6 MeV
  ?) 50 financing from INFN 250 K how to get
  the rest ??
• ??calibration new possibility (could be used to
  calibrate the DC system too)
• alphas neutrons on Ni update

MEG TN027
9
Electronics

• Trigger the test of the final boards wil be
  done in September, as foreseen in the schedule.
  On schedule
• DRS temperature dependence to be kept under
  control. DRS3 available in 2006 will substitute
  DRS2

Software

• MC status (BG simulation going on)
• DATA storage and CPU estimates

10

• No change in the expected sensitivity since last
  february
• We consider LHC as our competitor
• We will try to get significant results ASAP